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United States Patent | 6,225,850 |
Opris | May 1, 2001 |
A subcircuit including three bipolar transistors is substituted in place of a single bipolar transistor to achieve extrinsic base and emitter series resistance compensation in translinear circuits. The subcircuit substitution is applied to a Brokaw-type bandgap cell. The subcircuit substitution is applied to a current multiplier circuit, and the resulting circuit is rearranged for external control circuit efficiency. A low-voltage bandgap circuit uses an operational amplifier feedback circuit with bipolar transistors having differing emitter areas and a voltage divider to generate base voltages for a Brokaw-type bandgap cell. A proportional-to-absolute-temperature sensor circuit uses parallel two stacked bipolar transistor paths in which the bipolar transistors' emitter areas are selected to adhere to a relationship so as to provide extrinsic series base and emitter resistance compensation. A proportional-to-absolute-temperature sensor circuit and a bandgap reference circuit use parallel three stacked bipolar transistor paths in which the bipolar transistors' emitter areas are selected to adhere to a relationship so as to provide extrinsic series base and emitter resistance compensation and higher output voltage swings. A bandgap reference circuit has its output referenced to the positive supply voltage, and has stacked current branches in which all transistors have zero base-collector voltages, and are selected to adhere to a relationship so as to provide extrinsic series base and emitter resistance compensation.
Inventors: | Opris; Ion E. (22421 Walnut Cir. S., #B, Cupertino, CA 95014) |
Appl. No.: | 656022 |
Filed: | September 6, 2000 |
Current U.S. Class: | 327/356; 323/313; 327/327; 327/539 |
Intern'l Class: | G06F 007/44 |
Field of Search: | 327/538,539,355,356,357,358,359 323/312,313,314,315 |
3805092 | Apr., 1974 | Henson | 327/356. |
5151624 | Sep., 1992 | Stegherr et al. | 327/356. |
5214321 | May., 1993 | Curtis | 327/348. |
5581210 | Dec., 1996 | Kimura | 327/355. |
5796243 | Aug., 1998 | Kimura | 323/312. |
5889665 | Mar., 1999 | Han | 363/60. |